. Author manuscript; available in PMC: 2009 Nov 2.

Published in final edited form as: Mult Scler. 2009 May;15(5):587–592. doi: 10.1177/1352458509102622

TABLE 2.

Hand preference and the risk of MS in the Nurses’ Health Study

Variable	# Participants	# Cases	Age-adjusted Rate Ratio and 95% CI^†		Multivariate-adjusted^* Rate Ratio and 95% CI^†
Handedness
Naturally left-handed	5,303	22	1.65	(1.05–2.57)	1.62	(1.04–2.53)
Ambidextrous	4.720	10	0.99	(0.52–1.87)	0.99	(0.52–1.87)
Forced to change^‡	749	3	1.80	(0.57–5.65)	1.79	(0.57–5.65)
Naturally right-handed	77,990	175	1.0 (ref)		1.0 (ref)

Controlling for age in months, latitude tier at birth, SES (paternal occupation at age 16), sibship size, pack-years of cigarette smoking, quintile of vitamin D intake

^†

Confidence interval (CI)

^‡

With unreported innate hand preference